This IFD has the address to Raw data.
In the sample, raw data starts at the address 0x0024 D560 (entry #1) and the length is 16,908,088 byte (#2).
This raw data is encoded by 16bit gray scale Lossless JPEG (ITU-T T.81).

However, this raw data is not stored by actual sensor layout.
The three values in tag 0xC640 called "RawImageSegmentation" in exiftool ( or "CR2_clice" in "Understanding...")
requires to encode or decode.

Now let the three values be A,B and C.
The sensor width equals A times B pixel width and C pixel width.
sensorWidth = A x B + C

In the sample, values are 2, 1728 and 1888, and we can get three areas which each width are 1728,1728 and 1888.
Please see the following figure.

Then, we store the #0 area data sequentially into the image data array for lossless compress like following figure.

After storing #0, we store #1 and #2 area data as same.
The image data array is compressed into 16bit gray scale Lossless JPEG format and is stored in the address 0x0024 D560